BUG: bail out if no statistics are calculated by the serial superclass
BUG: bail out if no statistics are calculated by the serial superclass

Change-Id: I1cc4789b1d27afaa822ca8521dd0dfe0a144dea3

ashray/VTK-EVM,demarle/VTK,sumedhasingla/VTK,biddisco/VTK,berendkleinhaneveld/VTK,collects/VTK,jmerkow/VTK,collects/VTK,ashray/VTK-EVM,keithroe/vtkoptix,gram526/VTK,biddisco/VTK,msmolens/VTK,jmerkow/VTK,spthaolt/VTK,SimVascular/VTK,keithroe/vtkoptix,msmolens/VTK,hendradarwin/VTK,gram526/VTK,keithroe/vtkoptix,jmerkow/VTK,demarle/VTK,demarle/VTK,msmolens/VTK,aashish24/VTK-old,johnkit/vtk-dev,gram526/VTK,keithroe/vtkoptix,spthaolt/VTK,keithroe/vtkoptix,msmolens/VTK,SimVascular/VTK,msmolens/VTK,sumedhasingla/VTK,sankhesh/VTK,cjh1/VTK,biddisco/VTK,ashray/VTK-EVM,candy7393/VTK,demarle/VTK,sankhesh/VTK,daviddoria/PointGraphsPhase1,msmolens/VTK,keithroe/vtkoptix,gram526/VTK,keithroe/vtkoptix,ashray/VTK-EVM,collects/VTK,daviddoria/PointGraphsPhase1,keithroe/vtkoptix,hendradarwin/VTK,sumedhasingla/VTK,ashray/VTK-EVM,sumedhasingla/VTK,sankhesh/VTK,mspark93/VTK,ashray/VTK-EVM,spthaolt/VTK,biddisco/VTK,SimVascular/VTK,biddisco/VTK,hendradarwin/VTK,biddisco/VTK,hendradarwin/VTK,johnkit/vtk-dev,spthaolt/VTK,demarle/VTK,msmolens/VTK,gram526/VTK,cjh1/VTK,daviddoria/PointGraphsPhase1,johnkit/vtk-dev,johnkit/vtk-dev,jmerkow/VTK,mspark93/VTK,spthaolt/VTK,ashray/VTK-EVM,demarle/VTK,sumedhasingla/VTK,sumedhasingla/VTK,hendradarwin/VTK,SimVascular/VTK,sumedhasingla/VTK,SimVascular/VTK,jmerkow/VTK,gram526/VTK,daviddoria/PointGraphsPhase1,cjh1/VTK,johnkit/vtk-dev,spthaolt/VTK,berendkleinhaneveld/VTK,sumedhasingla/VTK,sankhesh/VTK,jmerkow/VTK,mspark93/VTK,berendkleinhaneveld/VTK,aashish24/VTK-old,gram526/VTK,candy7393/VTK,SimVascular/VTK,demarle/VTK,SimVascular/VTK,berendkleinhaneveld/VTK,mspark93/VTK,aashish24/VTK-old,daviddoria/PointGraphsPhase1,jmerkow/VTK,cjh1/VTK,candy7393/VTK,aashish24/VTK-old,berendkleinhaneveld/VTK,hendradarwin/VTK,sankhesh/VTK,aashish24/VTK-old,ashray/VTK-EVM,gram526/VTK,candy7393/VTK,daviddoria/PointGraphsPhase1,SimVascular/VTK,collects/VTK,sankhesh/VTK,mspark93/VTK,biddisco/VTK,berendkleinhaneveld/VTK,mspark93/VTK,demarle/VTK,aashish24/VTK-old,sankhesh/VTK,candy7393/VTK,johnkit/vtk-dev,spthaolt/VTK,cjh1/VTK,mspark93/VTK,hendradarwin/VTK,msmolens/VTK,candy7393/VTK,collects/VTK,berendkleinhaneveld/VTK,mspark93/VTK,cjh1/VTK,sankhesh/VTK,candy7393/VTK,jmerkow/VTK,collects/VTK,johnkit/vtk-dev,candy7393/VTK